Method of purifying rosin



Patented Mar. 15, 1932 UNITED STATES PATENT OFFICE JOSEPH N. BORGLIN, 0]? KEN'V'IL, NEW JERSEY, ASSIGNOB '10 HERCULES POWDER COM- rm, OF WILMINGTON, DELAWARE, A CORPORATION OF DELAWARE METHOD OI! PURIFYING ROBIN No Drawing.

My invention relates to a method purifying rosin, more particularly wood rosin and the lower grades of gum rosin.

As is well known wood rosin, such as is obtained from pine Wood, and the lower grades of gum rosin, do not lend themselves to use in the production of soaps, sizing for the highest grade papers, high rade var nishes, etc., since they, and especially wood rosin, contain inert color bodies which on exposure to oxygen, as in the air, and more especially to air and an alkali, as in soaps, tend to darken and undesirably darken the color of the roduct in which they are incorporated. I n the case, for example, of soaps made with wood rosin, or low grade gum rosin, the soap is ordinarily of a dark color when produced and discolors badly on aging.

Wood rosin, as is well known, is principally produced by extracting pine wood, from which turpentine has been removed by steam distillation, with a solvent for the rosin, as gasoline, the rosin bein recovered by distilling ofi' the solvent. ood rosin as heretofore roduced has been urified to an extent. fiowever, wood ros1n and low grade gum rosin cannot be purified by ordinary methods, as distillation, to an extent permitting their use in connection with soaps, high grade paper size, etc.

Now in accordance with my invention I provide a process for the treatment of wood rosin and low grade gum rosin by which such will be purified to an extent enabling their use in soaps, etc, without causing discoloration on aging.

The process embodying my invention involves broadly the distillation of wood rosin or low grade gum rosin in the presence of a boron compound, such, for example, as com mon borax, boric acid, boric anhydride and the like. My invention also contemplates the treatment, as by washing, of a solution of wood rosin or low grade gum rosin in a solvent, as gasoline, or other li ht hydrocarbon distillate, or a workable equivalent therefor, with a boron compound, as, for example, borax in solution to remove from the gasoline-rosin solution a portion of the rosin and Application filed December 14, 1829. Serial no. 414,227.

then distilling rosin recovered from the gasoline-rosin solution in the presence of a boron compound, for example, boric acid. The Washing of the rosin solution with a boron compound in solution acts to effect separation of a portion of the color bodies, including inert or latent color bodies, from the rosin.

The treatment of wood rosin and low grade gum rosin in accordance with my invention will produce a rosin which is of light color and which will retain its light color on aging and will not cause soaps and the like to darken or discolor on aging.

In accordance with my invention I may effect distillation of the rosin in the presence of preferably from about 0.3% to about 1.0%

of a boron compound and the distillation is preferably efi'ected at a temperature of from about 250 C. to about 290 (3., under a pressure of from about 1 to about 2 centimeters of mercury. When in the carrying out of my invention a rosin solution, as a solution of rosin in a solvent, as gasoline, other light hydrocarbondistillate, or workable equiva-, lent, is used, the rosin solution is washed with a boron solution, preferably a borax solution, to remove preferably above 8% of the rosin from the solution. The remaining rosin is separated from the solvent, as by the distillation ofi of the solvent, and then distilled in the presence of a boron compound, preferably boric acid.

As a typical example of the process embodying my invention, one part of powdered boric acid (H BO is mixed with 100 parts of wood rosin grading FF in color and the rosin distilled, in any suitable apparatus, at a temperature between about 250 C. and about 290 C. under a pressure of about 1 to 2 centimeters of mercury. About 70 parts of rosin grading N in color are obtained.

Under similar conditions the distillation of wood rosin with about 0.3% of boric anhydride (B 0 will give substantiall the same result. Ordinary borax (Na B, .10H O) may be used in place of boric acid or boric anhydride, but due to the presence of a large amount of water of crystallization, the heating should be gradual at first in order to avoid foaming, therefore anhydrous borax is preferre With the use of 1 part of hydrated borax to 100 parts of wood rosin distillation as with the use of boric acid yielded 72 parts of distilled rosin having an acid number of 168 and a soap produced therefrom was found to be greatly improved over the soap obtained from ordinary distilled rosin.

Proceeding with the use of a boron compound as above described, the rosin treated will be refined by the removal of color bodies and, more particularly, of inert or latent color bodies such as those which tend to darken in the presence of air and an alkali and which render the rosin containing such color bodies unusable for the production of soaps, sizes, etc. where light color is desired or essential, since such color bodies, as has been indicated, cause discoloration or darkening of soaps, sizes, etc. on aging.

The treatment of the rosin as described in the resence of a boron compound enables refining or separation of color bodies, more particularly inert or latent color bodies, from the rosin. In the treatment the distillate involves the refined rosin, the inert or latent color bodies remaining in the residue.

In the method in accordance with m invention the boron compound, when use for preliminarily washin 'the rosin and in connection with distillation of the rosin, acts to remove color bodies and more particularly latent color bodies from rosin, actin in the case of washing, as a solvent for t e color bodies and in a minor degree for the rosin. In washing with boron compound in solution a certain amount of rosin and latent color bodies is dissolved and may be separated from the rosin solution and in the case of distillation in the presence of the boron compound, it serves to retain the color bodies in the residue.

As has been indicated, a solution of wood rosin in a solvent therefor, as. gasoline, or other light hydrocarbon distillate or workable equivalent therefor, may be washed with a borax solution sufiicient to remove about 8% of the rosin. The remaining rosin is then recovered from the solution with its solvent, as gasoline, and distilled with the addition of say about 0.5% boric acid. Such treatment will give a rosin which will produce a soa which will not discolor on aging.

aving now fully described my invention, what I claim and desire to protect by Letters Patent is:

1. The method of purifyi rosin, which includes distillin rosin in t e presence 0 boric acid and col acting the distillate.

2. The method of purifying rosin, which includes admixing boric acid with rosin, distilling the rosin and collecting the distillate.

3. The method of purifying rosin, which includes admixing rosin with about 0.3% of Lamas? boric acid distilling the rosin and collecting the distillate.

4. The method of purifying rosin, which includes admixing rosin with about 0.3% of boric acid distilling the rosin at a temperature of from about 250 C. to about 290 C. and collectinghthe distillate.

5. The met 0d of purifying rosin, which includes admixing rosin with about 0.3% of boric acid distilling the rosin under a pressure of from about 1 to about 2 centimeters of mercury and at a temperature of about 250 C to about 290 C. and collecting the distillate.

6. The method of purifying rosin which includes distilling 10S1Il in the presence of a compound of boric acid and collecting the distillate.

7. The method of purifying includes admixin a compoun with rosin distilling the distillate.

8. The method of purifying rosin which includes admixing rosin with about 0.3% to about 1.0% of a compound of boric acid and distilling the rosin.

9. The method of purifyin rosin which includes admixing a compoun of boric acid with rosin distillin the rosin at a temperature of about 250 to 290 C. and collect ing the distillate.

10. The method of purifying rosin which includes distilling the rosin in the presence of 211. boron compound and collecting the distilate.

11. The method of purifying rosin which includes admixing a boron compound with (llistilling the rosin and collecting the distilate.

12. The method of purifying rosin which includes distilling'rosin in the presence of boron compound under a pressure less than 76 centimeters mercury, and collecting the distillate.

13. The method of purifying rosin which includes distilling rosin in the presence of boric acid under a pressure less than 76 centimeters mercur and collecting the distillate.

14. The met od of urifying rosin which includes admixing I'OSlIl with about 0.3% of boric acid, distilling the rosin under a pressure less than 76 centimeters mercury and collecting the distillate.

15. The method of purifying rosin which includes admixing rosin with about 03-10% of a compound of boric acid, distilling the rosin under a pressure less than 76 centimeters mercury and collecting the distillate.

16. The method of purifying rosin which includes mixing rosin with about 03-10% of boron compound, distilling the rosin under a pressure less than 76 centimeters mercury and collecting the distillate.

17. The method of purifying rosin which includes distilling rosin in the presence of rosin which of boric acid the rosin and collecting boron compound under a lessjthm 76 centimeters mercuryon at a temperature of about 250-290? C. and collecting the distillate. I

18. The method of purifying rosin which includes a. distilling rosin in the presence of a boron compound under a pressure of about 2 centimeters mercury and collecting the distillate. I v

19. The method of 'purifying rosin which includes distilling rosin in the presenceof boric acid under a pressure of about 2 centimeters mercu and collecting the distillate.

20. The met 0d of purifyin rosin which includes admixing rosin with a ut 0.3-1.0% of a boron compound, distilling the rosin under a ressure of about 2 centimeters mercury and collecting the distillate.

21. The method of purifyin rosin which includes admixin lOSlIl with a out 0.31.0% of boric acid, distillin the rosin under a pressure of about 2 centlmeters mercury and collecting the distillate.

22. The method of purifying rosin which includes distilling I0S1ll in the presence of about 0.31.0% of a. boron compound at a temperature of about 250290 C. under pressure of about 1-2 centimeters of mercu In testimony of which invention, I ave hereunto set my hand, at Kenvil, N. J on this- 12th day of December,- 1929.

- (Seal) JOSEPH N. BORGLIN.

CERIIFICA'I'E 0F CORRECTION.

Grcnted March '15, 1932, to

JOSEPH N. liORGLlNQ Patent No. 1,849, 537.

It is hereby certified that error'appearc in'the printed specification of the above numbered patent requiring correction aejollows: Page 2, 'Hnel02. claim 11, after the word "with" insert theword rosin and a coma; and that the said Letters Patent should be read with this correction therein that form to the record of "the cice in the Patent Office.

Signed end eealedthieBrd day of May, A. D. 1932.

MI'J. Moore, 4 Acting Comiecioner of Patents.

the same may conboron compound under a lessjthm 76 centimeters mercuryon at a temperature of about 250-290? C. and collecting the distillate. I

18. The method of purifying rosin which includes a. distilling rosin in the presence of a boron compound under a pressure of about 2 centimeters mercury and collecting the distillate. I v

19. The method of 'purifying rosin which includes distilling rosin in the presenceof boric acid under a pressure of about 2 centimeters mercu and collecting the distillate.

20. The met 0d of purifyin rosin which includes admixing rosin with a ut 0.3-1.0% of a boron compound, distilling the rosin under a ressure of about 2 centimeters mercury and collecting the distillate.

21. The method of purifyin rosin which includes admixin lOSlIl with a out 0.31.0% of boric acid, distillin the rosin under a pressure of about 2 centlmeters mercury and collecting the distillate.

22. The method of purifying rosin which includes distilling I0S1ll in the presence of about 0.31.0% of a. boron compound at a temperature of about 250290 C. under pressure of about 1-2 centimeters of mercu In testimony of which invention, I ave hereunto set my hand, at Kenvil, N. J on this- 12th day of December,- 1929.

- (Seal) JOSEPH N. BORGLIN.

CERIIFICA'I'E 0F CORRECTION.

Grcnted March '15, 1932, to

JOSEPH N. liORGLlNQ Patent No. 1,849, 537.

It is hereby certified that error'appearc in'the printed specification of the above numbered patent requiring correction aejollows: Page 2, 'Hnel02. claim 11, after the word "with" insert theword rosin and a coma; and that the said Letters Patent should be read with this correction therein that form to the record of "the cice in the Patent Office.

Signed end eealedthieBrd day of May, A. D. 1932.

MI'J. Moore, 4 Acting Comiecioner of Patents.

the same may con- 

